As the name implies, it is a pyramid-like structure arranged in tiers with the lowest quality backlinks in the bottom tier and the high quality ones in the top tier. A link pyramid mostly consists of 3 tiers:

TIER 1:The links in this tier should be of high quality from high PR blogs, social bookmarks, high authority sites etc. they must be manually created with good diversity to avoid Google ban.

TIER 2: This contains medium quality backlinks made of wiki, article sites, low PR blogs etc. Second-tier links should be pointing towards your 1st-tier links only. The main purpose is to strengthen the quality of your tier-1 links and improve its index.

TIER 3: blog comments, low PR web2.0, low PR social bookmarking, wiki sites, general directories etc form major of this tier. Purpose of this is also to improve the quality of tier-2 links. This is where Spam links are created but it shouldn’t be much to avoid Google penalty.

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